“if the parents don’t teach their kids about the birds and the bees so be it”
Even the youngest of children know through common sense that Mommy is a woman and Daddy is a man. With open eyes they see that Man + Woman = baby while Man + Man = HIV. It is not something that even needs to be taught - it is self evident.
Exactly, your orientation is dictated by your biology, it doesn’t take a genious to figure out the sexual orientation biologically of an adult male. Denial of this orientation and a wish to behave in actions that are counter to this biological orientation is simply mental illness, nothing more.